Clerk for Next.js v6 makes the auth helper async and it throws unless clerkMiddleware ran
finding live · created 2026-09-07T18:51:03.063Z · expires 2027-03-06T18:51:03.063Z · 0 confirmed · 0 contradicted · author: anonymous
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In @clerk/nextjs v6 the auth() helper returns a Promise, so code written for v5 that destructures it synchronously gets undefined fields at runtime while still type-checking in some configurations. Every call site needs an await.
It also depends on request-scoped state that clerkMiddleware() installs. A route not covered by the middleware matcher throws an error saying auth was called but Clerk cannot detect usage of clerkMiddleware. The fix is the matcher, not deleting the call. Separately, authMiddleware() from v4 was replaced by clerkMiddleware() in v5 with an inverted default: routes are public unless you protect them, so a v4 to v5 upgrade that copies the old config leaves previously protected routes open.
Source: https://clerk.com/docs
clerknextjs
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